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HUMMINGBIRD MIGRATION 2014

Friday, March 20, 2015

HOORAY FOR THE OFFICIAL FIRST DAY OF SPRING!

Hi Everybody!!Here is a fine day to celebrate as the first day of Spring arrives at 5:45pm today. Shared below is info from Wikipedia about the equinox event in progress. Goodbye to the long, cold winter as signs of flowers and songbirds replace ice and snow. Your photostudy today is more of the colorful blossoms appearing in my yard. Say goodbye to your 'winter blues' and walk outside to see the Spring come in! In addition, it is International Day of Happiness, so share the good feelings. Wake Up all you sleepy bears and Enjoy!

https://en.wikipedia.org/wiki/Equinox

An equinox occurs twice a year, around 20 March and 22 September. The word itself has several related definitions. The oldest meaning is the day when daytime and night are of approximately equal duration.[2] The word equinox comes from this definition, derived from the Latinaequus (equal) and nox (night). The equinox is not exactly the same as the day when period of daytime and night are of equal length for two reasons. Firstly, sunrise, which begins daytime, occurs when the top of the Sun's disk rises above the eastern horizon. At that instant, the disk's center is still below the horizon. Secondly, Earth's atmosphere refractssunlight. As a result, an observer sees daylight before the first glimpse of the Sun's disk above the horizon. To avoid this ambiguity, the word equilux is sometimes used to mean a day on which the periods of daylight and night are equal.[3][note 1] Times of sunset and sunrise vary with an observer's location (longitude and latitude), so the dates when day and night are closest together in length depend on location.

The other definitions are based on several related simultaneousastronomical events, and refer either to the events themselves or to the days on which they occur. These events are the reason that the period of daytime and night are approximately equal on the day of an equinox.

An equinox occurs when the plane of Earth's Equator passes the center of the Sun. At that instant, the tilt of Earth's axis neitherinclines away from nor towards the Sun. The two annual equinoxes are the only times when the subsolar point—the place on Earth's surface where the center of the Sun is exactly overhead—is on the Equator, and, consequently, the Sun is at zenith over the Equator. The subsolar point crosses the equator, moving northward at the March equinox and southward at the September equinox.

During an equinox, the Earth's North and South poles are not tilted toward or away from the Sun, and the duration of daylight is theoretically the same at all points on Earth's surface.

At an equinox, the Sun is at one of the two opposite points on the celestial sphere where the celestial equator (i.e. declination 0) andeclipticintersect. These points of intersection are called equinoctial points: classically, the vernal point (RA = 00h 00m00s and longitude = 0°) and the autumnal point (RA = 12h 00m 00s and longitude = 180°).

The equinoxes are the only times when the solar terminator is perpendicular to the Equator. As a result, the northern and southern Hemispheres are illuminated equally.

I want to meet Gardeners, Artists, Nature Lovers and see the World through others photos and stories. I share the adventures of mine at Kates Cabin Bird Sanctuary in Texas on Google+ in digital compositions of my Nature Photos.